Get List of Inventory Hosts that Match a patter

[Joaquin Menchaca]

How can I enumerate all the host names in the inventory that match a particular pattern?  For example, I would like to grab all the supervisors from this set.  I want to use this list to configure something in a configuration file.

My dynamic inventory would return something like like this:

{

  "vagrant": [

    "nimbus",

    "supervisor1",

    "supervisor2",

    "zookeeper"

  ],

  "_meta": {

    "hostvars": {

      "nimbus": {

        "ansible_ssh_host": "192.168.54.4",

        "ansible_ssh_user": "vagrant",

        "ansible_ssh_private_key_file": ".vagrant/machines/nimbus/virtualbox/private_key"

      },

      "supervisor1": {

        "ansible_ssh_host": "192.168.54.5",

        "ansible_ssh_user": "vagrant",

        "ansible_ssh_private_key_file": ".vagrant/machines/supervisor1/virtualbox/private_key"

      },

      "supervisor2": {

        "ansible_ssh_host": "192.168.54.6",

        "ansible_ssh_user": "vagrant",

        "ansible_ssh_private_key_file": ".vagrant/machines/supervisor2/virtualbox/private_key"

      },

      "zookeeper": {

        "ansible_ssh_host": "192.168.54.3",

        "ansible_ssh_user": "vagrant",

        "ansible_ssh_private_key_file": ".vagrant/machines/zookeeper/virtualbox/private_key"

      }

    }

  }

}